To answer the question, there's a bit of irrationality going on here. The primary actors for national security are the service, the RCMP, the CSE, and then National Defence and the CBSA. Let's call them the main actors.
When you drill away from that and look at the Department of Transport, they may have a national security remit, but it would be sort of a knock-on remit, if I can put it that way. Let's say CSIS has intelligence about some weakness to some rail system somewhere, or somebody's going to blow up something at a rail system. They would then want to activate the Department of Transport for assistance, and our provincial partners as well.
It seems to me that it should be about information getting to the main actors in national security, because that's what this is about. It's not just simply the service giving information to the CRA to help them collect your taxes.